This is a great deal. For the benefit of whoever gets it I will share the results of my research: on the gain question, Nelson Pass himself responded to my question in the DIY forum, writing: "The phono stage is about 40 dB at 1 KHz, switchable to 60 dB for MC cartridges. The high level stage is probably 20 dB." On the impedance question, Jon Soderberg <vintageamp@surewest.net> wrote:
"Hi Ron,
I believe it is 100 ohms. I'm am sure it will work just fine. Just avoid long cables.
I replace the electrolytic caps for $350"
Good luck with the sale!